// (c) Copyright HutongGames, LLC 2010-2016. All rights reserved.

using UnityEngine;

namespace HutongGames.PlayMaker.Actions
{
	[ActionCategory(ActionCategory.Physics2D)]
	[Tooltip("Sets the 2d Velocity of a Game Object. To leave any axis unchanged, set variable to 'None'. NOTE: Game object must have a rigidbody 2D.")]
    public class SetVelocity2d : ComponentAction<Rigidbody2D>
	{
		[RequiredField]
		[CheckForComponent(typeof(Rigidbody2D))]
		[Tooltip("The GameObject with the Rigidbody2D attached")]
		public FsmOwnerDefault gameObject;

		[Tooltip("A Vector2 value for the velocity")]
		public FsmVector2 vector;

		[Tooltip("The y value of the velocity. Overrides 'Vector' x value if set")]
		public FsmFloat x;

		[Tooltip("The y value of the velocity. Overrides 'Vector' y value if set")]
		public FsmFloat y;

		[Tooltip("Repeat every frame.")]
		public bool everyFrame;
		
		public override void Reset()
		{
			gameObject = null;
			vector = null;
			// default axis to variable dropdown with None selected.
			x = new FsmFloat { UseVariable = true };
			y = new FsmFloat { UseVariable = true };


			everyFrame = false;
		}
		
		public override void Awake()
		{
			Fsm.HandleFixedUpdate = true;
		}		
		
		// TODO: test this works in OnEnter!
		public override void OnEnter()
		{
			DoSetVelocity();
			
			if (!everyFrame)
			{
				Finish();
			}		
		}
		
		public override void OnFixedUpdate()
		{
			DoSetVelocity();

		    if (!everyFrame)
		    {
		        Finish();
		    }
		}
		
		void DoSetVelocity()
		{
            var go = Fsm.GetOwnerDefaultTarget(gameObject);
            if (!UpdateCache(go))
            {
                return;
            }
			
			// init position
			
			Vector2 velocity;
			
			if (vector.IsNone)
			{
                velocity = rigidbody2d.linearVelocity;

			}
			else
			{
				velocity = vector.Value;
			}
			
			// override any axis
			
			if (!x.IsNone) velocity.x = x.Value;
			if (!y.IsNone) velocity.y = y.Value;
			
			// apply

            rigidbody2d.linearVelocity = velocity;
		}
	}
}